diff options
| author | Vlad Zolotarov <vlad@scalemp.com> | 2012-02-05 15:24:39 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-02-05 22:42:00 -0500 |
| commit | 94bf91baf3a16ec274de3cd913be3033c029f853 (patch) | |
| tree | 228947bbd33977940a8262512072528a64cdfa30 | |
| parent | b033281f618fa40ee1b24a60cd8043b4979bfee4 (diff) | |
bnx2: Add missing memory barrier in bnx2_start_xmit()
Sync DMA descriptor before hitting the TX mailbox for weak memory model
CPUs.
There has been discussions several years ago about this. Some believe
that writel() should guarantee ordering. Others want explicit barriers
if necessary. Today writel() does not have the ordering guarantee and
many other drivers use explicit barriers.
Signed-off-by: Vlad Zolotarov <vlad@scalemp.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/broadcom/bnx2.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/ethernet/broadcom/bnx2.c b/drivers/net/ethernet/broadcom/bnx2.c index 2ab31daef80..7105989ba65 100644 --- a/drivers/net/ethernet/broadcom/bnx2.c +++ b/drivers/net/ethernet/broadcom/bnx2.c @@ -6565,6 +6565,9 @@ bnx2_start_xmit(struct sk_buff *skb, struct net_device *dev) } txbd->tx_bd_vlan_tag_flags |= TX_BD_FLAGS_END; + /* Sync BD data before updating TX mailbox */ + wmb(); + netdev_tx_sent_queue(txq, skb->len); prod = NEXT_TX_BD(prod); |